poster



(No Model.) '2 sheets-sheet 2.l

J. M. FOSTER. f PRESSURE REG ULATING VALVE. No. 414,975. v Paterlted Nov. 12 18.89.

NITED STATES ATEENT Fries.

.IOIIN M. FOSTER, OF NEV YORK, N. Y.

PRESSURE-REGULATING VALVE.

SPECIFICATION forming part of Letters Patent No. 414,975, dated November 12, 1889.

Application filed October 8, 1889. Serial No. 326,316. (No model.)

To all whom, it may concern:

Be it known that I, JOHN M. FOSTER, a citizen of the United States, and a resident of New York city, New York, have in vented Improvements in Pressure-Regulating Valves, of which the following is a speciication.

My invention consists of certain improvements in the combined pressu11e-regulating valve and governor for which I have obtained a vertical section of a pressure-regulating valve and governor provided with my improvements. Fig. 2 is a detached plan view of the adjustable nut or collar against which the regulating-spring bears. Fig. 3 is a vertical sectional view showing the application of my improvements to another form of regulating-valve and governor.

Referring to Figs. l and 2, A is the valve casing, with an inlet a and an outlet b, and with a seat d for the valve D. The stem S of this valve is threaded at s and adapted to a corresponding thread in the stufing-box E, carried by the flexible diaphragm F. In the present instance the rim of this iiexible diaphragm is secured by a ring R and bolts or screws p within the rim of the dish I-I, which is itted to the valve-casing and is in effect a part thereof. The stem of the valve may be provided on the outside with a square or a polygonal head for the application of a suitable operating handle or tool, or it may be provided with a hand-wheel or lever-handle. By adjusting this stem the valve D may be brought toward or removed from its seat in proportion to the pressure of steam or other fluid required on the distributing side of the valve. The lower end of this valve-stem is threaded, and this may be a continuation of the thread formed to work in the stuffingbox. Upon this lower threaded portion of the -stem is mounted the adjustable collar or nut N, which is constructed so that it cannot turn with the stem, but can move longitudinally therewith. For this purpose, as in my former regulator, the periphery of the nut is made polygonal and adapted to a corresponding opening in the casing. The spiral spring T at its lower end bears upon this nut or collar, and at its upper end bears upon the shoulder t, carried by the wings t of the dish or casing.

The operation of the parts described is substantially the same as that described in my above-mentioned patent. In the regulator of my former patent when it was desired, however, to change thetension of 'the spring T it ybecame necessary to remove the bottom plug P and to unscrew the nut end from the stem after first removing 'the valve.

By my present invention I provide a simpler way of changing the tension of the spring by making the stuffing-box E, which is carried by the exible diaphragm, capable of being freed or detached from the diaphragm, so that it can be turned thereon. For this purpose the stuiiing-box E is provided with a flange e., between which and a ring f the diaphragm is clamped by screwing down the nut f upon the exterior of the stuffing-box onto the ring f.

Then it is desired to change the tension of the spring, the nut f is released, so as to free the stuffing-box from the diaphragm and enable the stuliing-box to be turned independentlyV of the latter. The stuffing-box is then turned in whichever direction it may be necessary to increase or decrease the tension of the spring, and, as the collar or nut N cannot (owing to its confinement within the casing) turn with the stem, the relative distance between the nut and the stuffing-box or coli lar t will be changed as the stuffing-box is turned. The stuffing-box is then irmly reclamped to the diaphragm simply by screwing up the nut f.

In order to prevent the accidental bulging of or other damage to the diaphragm from turning on the pressure when the valve happens t-o be screwed down, I provide a projection or projections n, preferably in the form of `a flange on the lower edge of the nut or collar N to come into contact with the casing if the pressure tends to raise the diaphragm beyond a given limit.

IOO

In the modification illustrated in Fig. 3 I have shown my invention as applied to a valve of much larger capacity than that shown in Fig. l; but my improvements in the two cases are substantially alike. The valve D, carried by the threaded stem which is adjustable in the stuiling-box E in the casing, is of a somewhat different construction from that illustrated in Fig. l. The nut N, against which the spring 'l acts, is substantially the same in construction as that already dc scribed, and the stutling-box E in this case also is detachably secured to the diaphragm J1" by a clamp similar to that described. To assist the spring T, however, I have in this case provided also weights il", suspended from the end of a lever L, pivoted to the upper end of the standard Z on the casing. This weighted lever L bears upon the top of a swivel s', which receives the upper threaded end of the valve-stem S. The latter is provided with a square /r for the application of a tool to turn it to change the adjustment ot' the valve.

I claim as my invention- 1. The combination of a regulating-valve and casing carrying` a diaphragm open to the fluid-pressure and a stuiling-box carried by but detachable from the diaphragm with a threaded valve stem adapted to the said stui ing-box and a spring bearing on a nut orcollar free to move longitudinally with the stem,

`clamped to the diaphragm with a threaded valve-stem adapted to the stuiling-box and a spring,1 bearing on a nut or collar free to move longitudinally with the stem, but not free to turn therewith, all substantially as described.

3. The combination of a regulating-valve and casing carrying a diaphragm open to the' {luid-pressure with a valve-stem carried by the diaphragm and having a nut or collar with a projection or projections to prevent excessive lift of the diaphragm, substantially as described.

4. The combination el a casing carrying a diiitphragm open to the Huid-pressure and a valve adjustably mounted in the diaphragm with a spring and an adjustable weight to actupon the valve against the said fluidpressure, substantially as described.

In testimony whereof I have signed my name to this specieation in the presence of two subscribing witnesses.

JOHN M. FOS'IER.

Witnesses:

EDITH J. Gniswonn, JOHN REVELL. 

